Lois, He chose the ow because she will look up to him. She is in need of rescuing. He wants to have fun and maybe she'll have fun w/him, i.e., spending his money and getting him to jump through hoops while the other brain is talking.
You are doing great and please do not think that your special needs child or your teen daughter were the reason he left home. If that were the case, you would have left long ago yourself. Nope...not the wheel that created h is crisis.
Good, I'm glad to see that you've met 1/3 of your monthly goal. Staying busy will help you to keep your focus off of what he's doing.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.